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1 vote
0 answers
93 views

I already obtained the dual variables of a constraint writting the "model.dual = Suffix(direction=Suffix.IMPORT_EXPORT)" and so on, using CBC.exe as solver. But I'm trying to link my code ...
0 votes
2 answers
178 views

I have a NLP model written in GAMS and I would like to use ROI (R Optimisation Interface) to send it to the NEOS Server. It looks like ROI_read() is the command for reading in external models, but I ...
0 votes
1 answer
646 views

I'm new to AMPL/NEOS and optimization problems in general. I have a mod file that looks like this: PARAMETERS param n; # number of observations param p; # number of features param ResponseVariable{i ...
0 votes
0 answers
43 views

I am trying to solve an LP file(Link to google drive if you would like to try it) via CPLEX on the NEOS servers. I can find the objective value quite easily, that being 9.200000000000e+01. However, I ...
2 votes
1 answer
5k views

i'm very new in Neos CMS. I install Neos CMS according to this tutorial https://neutroncloud.in/docs/how-to-install-neos-cms-on-ubuntu/. I've been struggling for 3 days for install it. When i finally ...
marekus's user avatar
  • 35
2 votes
2 answers
2k views

I have recently started in doing some OR, and have been trying to use Pyomo and NEOS to do some optimation problems. I have been following along with one of the UT Austin Pyomo lectures, and when my ...
0 votes
2 answers
361 views

How can I solve a nonlinear model with DICOPT solver in Pyomo? Is this possible to use DICOPT solver through Neos for Pyomo?
1 vote
2 answers
1k views

I wrote a very simple model in Pyomo environment and added the following two commands at the end. solver_manager = SolverManagerFactory('neos') results = solver_manager.solve(model, opt='cplex') It ...
0 votes
1 answer
353 views

As per the link from NEOS twitter page, they say an Email address needs to be added before submitting the job. Is the pyomo for NEOS solver updated accordingly? Please find the links below for more ...
0 votes
1 answer
268 views

I'm trying to learn how to send an optimization problem to NEOS Server to solve it with BARON, but I'm receiving an error which says NEOS is currently unavailable even though I've been trying it for ...
0 votes
1 answer
480 views

I am trying to solve a problem by submitting it to NEOS and using ipopt as a slover: solver_manager = SolverManagerFactory('neos') results = solver_manager.solve(self.miqp_instance, opt='...
Betty's user avatar
  • 268
0 votes
1 answer
55 views

I am using MINLP with NEOS solver, my problem is non-convex and I get this Cannot evaluate constraint(s) at starting point what does this mean and how I can fix it?
user avatar
2 votes
1 answer
945 views

I am using Pyomo to run BONMIN solver from the NEOS server. However, it returns a simple log file without any useful information such as the number of iterations. Can you let me know what I should do ...
0 votes
0 answers
859 views

I'm using the neos bonmin solver to find a global minimum solution to a highly constrained mixed integer non-linear problem. Below are results for models that are identical, except the coefficients in ...
1 vote
0 answers
433 views

I'm using the neos-server to solve a highly constrained MINLP, using the bonmin algorithm. Solving using either a Branch and Bound or the hybrid method. The input code is AMPL I want to know if it's ...

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